package com.ys.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.ys.common.to.es.SkuEsModel;
import com.ys.common.utils.R;
import com.ys.gulimall.search.config.GulimallESConfig;
import com.ys.gulimall.search.constant.EsConstant;
import com.ys.gulimall.search.feign.ProductFeignService;
import com.ys.gulimall.search.service.MallSearchService;
import com.ys.gulimall.search.vo.AttrResponseVo;
import com.ys.gulimall.search.vo.SearchParam;
import com.ys.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Description:
 * @author： yeswater
 * @create： 2024/5/13
 */

@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {
	
	@Resource
	private RestHighLevelClient esClient;
	
	@Resource
	private ProductFeignService productFeignService;
	
	@Override
	public SearchResult search(SearchParam param) {
		// 1、动态构建出查询需要的DSL
		SearchResult result = null;
		
		// 构建检索请求
		SearchRequest searchRequest = buildSearchRequest(param);
		
		try {
			// 2、执行检索你请求
			SearchResponse response = esClient.search(searchRequest, GulimallESConfig.COMMON_OPTIONS);
			// 3、分析响应数据 封装成需要的格式
			result = buildSearchResult(response, param);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
		
		return result;
	}
	
	/**
	 * 构建检索请求
	 * <p>
	 * 模糊匹配，过滤（按照属性、分类、品牌，价格区间，库存），完成排序、分页、高亮,聚合分析功能
	 */
	private SearchRequest buildSearchRequest(SearchParam param) {
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		
		/**
		 * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
		 */
		//1. 构建bool-query
		BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
		
		//1.1 bool-must 模糊匹配
		if (!StringUtils.isEmpty(param.getKeyword())) {
			boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
		}
		
		//1.2 bool-filter
		//1.2.1 catelogId 按三级分类ID
		if (null != param.getCatalog3Id()) {
			boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
		}
		
		//1.2.2 brandId 按品牌ID
		if (null != param.getBrandId() && param.getBrandId().size() > 0) {
			boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
		}
		
		//1.2.3 attrs
		if (param.getAttrs() != null && param.getAttrs().size() > 0) {
			
			param.getAttrs().forEach(item -> {
				//attrs=1_5寸:8寸&2_16G:8G
				BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
				
				//attrs=1_5寸:8寸
				String[] s = item.split("_");
				String attrId = s[0];
				String[] attrValues = s[1].split(":");//这个属性检索用的值
				boolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
				boolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
				
				NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", boolQuery, ScoreMode.None);
				boolQueryBuilder.filter(nestedQueryBuilder);
			});
			
		}
		
		//1.2.4 hasStock
		if (null != param.getHasStock()) {
			boolQueryBuilder.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
		}
		
		
		//1.2.5 skuPrice
		if (!StringUtils.isEmpty(param.getSkuPrice())) {
			//skuPrice形式为：1_500或_500或500_
			RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("skuPrice");
			String[] price = param.getSkuPrice().split("_");
			if (price.length == 2) {
				rangeQueryBuilder.gte(price[0]).lte(price[1]);
			} else if (price.length == 1) {
				if (param.getSkuPrice().startsWith("_")) {
					rangeQueryBuilder.lte(price[1]);
				}
				if (param.getSkuPrice().endsWith("_")) {
					rangeQueryBuilder.gte(price[0]);
				}
			}
			boolQueryBuilder.filter(rangeQueryBuilder);
		}
		
		//封装所有的查询条件
		searchSourceBuilder.query(boolQueryBuilder);
		
		
		/**
		 * 排序，分页，高亮
		 */
		
		//排序
		//形式为sort=hotScore_asc/desc
		if (!StringUtils.isEmpty(param.getSort())) {
			String sort = param.getSort();
			String[] sortFields = sort.split("_");
			
			SortOrder sortOrder = "asc".equalsIgnoreCase(sortFields[1]) ? SortOrder.ASC : SortOrder.DESC;
			
			searchSourceBuilder.sort(sortFields[0], sortOrder);
		}
		
		//分页
		searchSourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGE_SIZE);
		searchSourceBuilder.size(EsConstant.PRODUCT_PAGE_SIZE);
		
		//高亮
		if (!StringUtils.isEmpty(param.getKeyword())) {
			
			HighlightBuilder highlightBuilder = new HighlightBuilder();
			highlightBuilder.field("skuTitle");
			highlightBuilder.preTags("<b style='color:red'>");
			highlightBuilder.postTags("</b>");
			
			searchSourceBuilder.highlighter(highlightBuilder);
		}
		
		/**
		 * 聚合分析
		 */
		//1. 按照品牌进行聚合
		TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
		brand_agg.field("brandId").size(50);
		
		
		//1.1 品牌的子聚合-品牌名聚合
		brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg")
				                         .field("brandName").size(1));
		//1.2 品牌的子聚合-品牌图片聚合
		brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg")
				                         .field("brandImg").size(1));
		
		searchSourceBuilder.aggregation(brand_agg);
		
		//2. 按照分类信息进行聚合
		TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
		catalog_agg.field("catalogId").size(20);
		
		catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
		
		searchSourceBuilder.aggregation(catalog_agg);
		
		//2. 按照属性信息进行聚合
		NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
		//2.1 按照属性ID进行聚合
		TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
		attr_agg.subAggregation(attr_id_agg);
		//2.1.1 在每个属性ID下，按照属性名进行聚合
		attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
		//2.1.1 在每个属性ID下，按照属性值进行聚合
		attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
		searchSourceBuilder.aggregation(attr_agg);
		
		log.debug("构建的DSL语句 {}", searchSourceBuilder.toString());
		
		SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);
		return searchRequest;
	}
	
	/**
	 * 构建结果数据
	 */
	private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
		SearchResult result = new SearchResult();
		
		//1、返回的所有查询到的商品
		SearchHits hits = response.getHits();
		
		List<SkuEsModel> esModels = new ArrayList<>();
		//遍历所有商品信息
		if (hits.getHits() != null && hits.getHits().length > 0) {
			for (SearchHit hit : hits.getHits()) {
				String sourceAsString = hit.getSourceAsString();
				SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
				
				//判断是否按关键字检索，若是就显示高亮，否则不显示
				if (!StringUtils.isEmpty(param.getKeyword())) {
					//拿到高亮信息显示标题
					HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
					String skuTitleValue = skuTitle.getFragments()[0].string();
					esModel.setSkuTitle(skuTitleValue);
				}
				esModels.add(esModel);
			}
		}
		result.setProduct(esModels);
		
		//2、当前商品涉及到的所有属性信息
		List<SearchResult.AttrVo> attrVos = new ArrayList<>();
		//获取属性信息的聚合
		ParsedNested attrsAgg = response.getAggregations().get("attr_agg");
		ParsedLongTerms attrIdAgg = attrsAgg.getAggregations().get("attr_id_agg");
		for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
			SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
			//1、得到属性的id
			long attrId = bucket.getKeyAsNumber().longValue();
			attrVo.setAttrId(attrId);
			
			//2、得到属性的名字
			ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
			String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
			attrVo.setAttrName(attrName);
			
			//3、得到属性的所有值
			ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
			List<String> attrValues = attrValueAgg.getBuckets().stream().map(item -> item.getKeyAsString()).collect(Collectors.toList());
			attrVo.setAttrValue(attrValues);
			
			attrVos.add(attrVo);
		}
		
		result.setAttrs(attrVos);
		
		//3、当前商品涉及到的所有品牌信息
		List<SearchResult.BrandVo> brandVos = new ArrayList<>();
		//获取到品牌的聚合
		ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
		for (Terms.Bucket bucket : brandAgg.getBuckets()) {
			SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
			
			//1、得到品牌的id
			long brandId = bucket.getKeyAsNumber().longValue();
			brandVo.setBrandId(brandId);
			
			//2、得到品牌的名字
			ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
			String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
			brandVo.setBrandName(brandName);
			
			//3、得到品牌的图片
			ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
			String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
			brandVo.setBrandImg(brandImg);
			
			brandVos.add(brandVo);
		}
		result.setBrands(brandVos);
		
		//4、当前商品涉及到的所有分类信息
		//获取到分类的聚合
		List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
		ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
		for (Terms.Bucket bucket : catalogAgg.getBuckets()) {
			SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
			//得到分类id
			String keyAsString = bucket.getKeyAsString();
			catalogVo.setCatalogId(Long.parseLong(keyAsString));
			
			//得到分类名
			ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
			String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
			catalogVo.setCatalogName(catalogName);
			catalogVos.add(catalogVo);
		}
		
		result.setCatalogs(catalogVos);
		//===============以上可以从聚合信息中获取====================//
		//5、分页信息-页码
		result.setPageNum(param.getPageNum());
		//5、1分页信息、总记录数
		long total = hits.getTotalHits().value;
		result.setTotal(total);
		
		//5、2分页信息-总页码-计算
		int totalPages = (int)total % EsConstant.PRODUCT_PAGE_SIZE == 0 ?
				                 (int)total / EsConstant.PRODUCT_PAGE_SIZE : ((int)total / EsConstant.PRODUCT_PAGE_SIZE + 1);
		result.setTotalPages(totalPages);
		
		List<Integer> pageNavs = new ArrayList<>();
		for (int i = 1; i <= totalPages; i++) {
			pageNavs.add(i);
		}
		result.setPageNavs(pageNavs);
		
		
		//6、构建面包屑导航
		if (param.getAttrs() != null && param.getAttrs().size() > 0) {
			List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
				//1、分析每一个attrs传过来的参数值
				SearchResult.NavVo navVo = new SearchResult.NavVo();
				String[] s = attr.split("_");
				navVo.setNavValue(s[1]);
				R r = productFeignService.attrInfo(Long.parseLong(s[0]));
				if (r.getCode() == 0) {
					AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
					});
					navVo.setNavName(data.getAttrName());
				} else {
					navVo.setNavName(s[0]);
				}

				//2、取消了这个面包屑以后，我们要跳转到哪个地方，将请求的地址url里面的当前置空
				//拿到所有的查询条件，去掉当前
				String encode = null;
				try {
					encode = URLEncoder.encode(attr,"UTF-8");
					encode.replace("+","%20");  //浏览器对空格的编码和Java不一样，差异化处理
				} catch (UnsupportedEncodingException e) {
					e.printStackTrace();
				}
				String replace = replaceQueryString(param, attr, "attrs");
				navVo.setLink("http://search.gulimall.com/list.html?" + replace);

				return navVo;
			}).collect(Collectors.toList());

			result.setNavs(collect);
		}
		// 8.2、品牌
		if (null != param.getBrandId() && param.getBrandId().size() > 0) {
			List<SearchResult.NavVo> navs = result.getNavs();
			SearchResult.NavVo navVo = new SearchResult.NavVo();
			navVo.setNavName("品牌");
			// 远程查询所有品牌
			R r = productFeignService.brandInfo(param.getBrandId());
			if (0 == r.getCode()) {
				List<SearchResult.BrandVo> brands = r.getData("brands", new TypeReference<List<SearchResult.BrandVo>>() {
				});
				StringBuffer buffer = new StringBuffer();
				String replace = "";
				for (SearchResult.BrandVo brand : brands) {
					buffer.append(brand.getBrandName() + ";");
					replace = replaceQueryString(param, brand.getBrandId() + "", "brandId");
				}
				navVo.setNavValue(buffer.toString());
				navVo.setLink("http://search.gulimall.com/list.html" + (replace.isEmpty() ? "" : "?" + replace));
			}
			navs.add(navVo);
		}
		// 8.3、分类，不需要导航取消
		
		
		return result;
	}
	
	/**
	 * 替换原生的所有的查询条件
	 *
	 * @param param
	 * @param value
	 * @param key
	 * @return
	 */
	private String replaceQueryString(SearchParam param, String value, String key) {
		String queryString = param.get_queryString();
		String encode = null;
		try {
			encode = URLEncoder.encode(value, "UTF-8");
			encode = encode.replace("+", "20%");//浏览器对空格编码和java不一样
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return queryString.replace("&" + key + "=" + encode, "");
	}
}
